TM 5-2410-240-23-1
0021
Table 1. Cab Troubleshooting Without Codes. - Continued.
0021
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. HVAC Blower Motor Does Not
11. Turn battery disconnect switch
Function in One or More Speeds
and ignition switch to ON posi-
- Continued
tion (TM 5-2410-240-10).
12. Turn blower fan switch to
medium-high fan speed (TM
5-2410-240-10).
13. Using digital multimeter, mea-
Voltage Less Than Specified
sure for voltage (WP 0283)
Range - Proceed to step 17.
between harness connector
Voltage Within Specified Range
C-C74 (WP 0018, Figure 45)
- Proceed to step 14.
terminal 2 and terminal 4.
There should be approximately 18
to 26 volts.
14. Turn ignition switch and bat-
tery disconnect switch to OFF
position (TM 5-2410-240-10).
15. Disconnect harness connec-
tor C-C72 (WP 0018, Figure
43) from high fan relay (WP
0018, Figure 49).
16. Reconnect harness connector
Replace medium-high fan relay
C-C73 (WP 0018, Figure 44)
(WP 0018, Figure 50). Ensure all
to high fan relay (WP 0018,
harness connectors are recon-
Figure 49).
nected. Verify proper operation of
machine (TM 5-2410-240-10).
17. Turn ignition switch and bat-
tery disconnect switch to OFF
position (TM 5-2410-240-10).
18. Disconnect harness connec-
tor C-C73 (WP 0018, Figure
44) from medium-high fan
relay (WP 0018, Figure 50).
19. Reconnect harness connector
C-C73 (WP 0018, Figure 44)
to high fan relay (WP 0018,
Figure 49).
No Continuity - Replace lower
20. Using digital multimeter, test
cab wiring harness (WP 0228).
between harness connector
Ensure all harness connectors are
C-C72 (WP 0018, Figure 43)
reconnected. Verify proper opera-
terminal 2 and cab ground.
tion of machine (TM 5-2410-240-
10).
Continuity - Proceed to step 21.
0021-26